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108 lines
3.2 KiB
108 lines
3.2 KiB
import { ethErrors } from 'eth-rpc-errors';
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import { MESSAGE_TYPE } from '../../../../../shared/constants/app';
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/**
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* This method attempts to retrieve the Ethereum accounts available to the
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* requester, or initiate a request for account access if none are currently
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* available. It is essentially a wrapper of wallet_requestPermissions that
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* only errors if the user rejects the request. We maintain the method for
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* backwards compatibility reasons.
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*/
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const requestEthereumAccounts = {
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methodNames: [MESSAGE_TYPE.ETH_REQUEST_ACCOUNTS],
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implementation: requestEthereumAccountsHandler,
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hookNames: {
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origin: true,
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getAccounts: true,
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getUnlockPromise: true,
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hasPermission: true,
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requestAccountsPermission: true,
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},
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};
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export default requestEthereumAccounts;
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// Used to rate-limit pending requests to one per origin
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const locks = new Set();
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/**
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* @typedef {Record<string, string | Function>} RequestEthereumAccountsOptions
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* @property {string} origin - The requesting origin.
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* @property {Function} getAccounts - Gets the accounts for the requesting
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* origin.
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* @property {Function} getUnlockPromise - Gets a promise that resolves when
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* the extension unlocks.
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* @property {Function} hasPermission - Returns whether the requesting origin
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* has the specified permission.
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* @property {Function} requestAccountsPermission - Requests the `eth_accounts`
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* permission for the requesting origin.
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*/
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/**
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*
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* @param {import('json-rpc-engine').JsonRpcRequest<unknown>} _req - The JSON-RPC request object.
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* @param {import('json-rpc-engine').JsonRpcResponse<true>} res - The JSON-RPC response object.
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* @param {Function} _next - The json-rpc-engine 'next' callback.
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* @param {Function} end - The json-rpc-engine 'end' callback.
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* @param {RequestEthereumAccountsOptions} options - The RPC method hooks.
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*/
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async function requestEthereumAccountsHandler(
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_req,
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res,
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_next,
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end,
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{
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origin,
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getAccounts,
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getUnlockPromise,
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hasPermission,
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requestAccountsPermission,
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},
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) {
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if (locks.has(origin)) {
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res.error = ethErrors.rpc.resourceUnavailable(
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`Already processing ${MESSAGE_TYPE.ETH_REQUEST_ACCOUNTS}. Please wait.`,
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);
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return end();
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}
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if (hasPermission(MESSAGE_TYPE.ETH_ACCOUNTS)) {
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// We wait for the extension to unlock in this case only, because permission
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// requests are handled when the extension is unlocked, regardless of the
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// lock state when they were received.
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try {
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locks.add(origin);
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await getUnlockPromise();
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res.result = await getAccounts();
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end();
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} catch (error) {
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end(error);
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} finally {
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locks.delete(origin);
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}
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return undefined;
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}
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// If no accounts, request the accounts permission
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try {
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await requestAccountsPermission();
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} catch (err) {
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res.error = err;
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return end();
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}
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// Get the approved accounts
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const accounts = await getAccounts();
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/* istanbul ignore else: too hard to induce, see below comment */
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if (accounts.length > 0) {
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res.result = accounts;
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} else {
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// This should never happen, because it should be caught in the
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// above catch clause
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res.error = ethErrors.rpc.internal(
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'Accounts unexpectedly unavailable. Please report this bug.',
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);
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}
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return end();
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}
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